Hydraulic oil extraction wellhead sealing device

Abstract

The utility model discloses a hydraulic oil extraction wellhead sealing device which comprises a main body, the main body is of a hollow cylindrical structure, an inner core is sleeved with the main body, a main body stepped hole is formed in the main body, and a sealing protruding part is arranged at the position, corresponding to the main body stepped hole, of the inner core. The main body step hole is matched with the sealing protruding part to form one-way limiting, the right end of the inner core is provided with an oil pipe connecting part communicated with the main body, the left end of the main body is provided with a plug connecting part, a plug is assembled in the plug connecting part, and the main body is provided with a lateral connector in the radial direction in a through connection mode. An inner core passage penetrating through the oil pipe connecting part is arranged in the middle of the inner core, a penetrating connector passage is arranged in the middle of the lateral connector, and the inner core passage and the connector passage are communicated to solve the technical problems that in the prior art, sealing is not tight, and an inlet and outlet passage of power liquid cannot be provided.

Description

Technical Field

[0001] The utility model belongs to the technical field of oil and gas production, and particularly relates to a hydraulic oil production wellhead sealing device. Background Art

[0002] At present, domestic oilfield development attempts to use hydraulic oil recovery to solve the problem of lifting horizontal wells, high-angle wells and other oil wells with serious eccentric wear. Conventional rod pump oil production mainly relies on the wellhead packing box to seal the bare rod on the ground, which has the following disadvantages:

[0003] ① The packing box and the oil pumping rod are dynamic seals, the packing is severely worn and needs to be replaced regularly or irregularly, wasting a lot of manpower and material resources;

[0004] ② Conventional rod pump oil production may cause leakage of well fluid in the oil well due to eccentric wear of the packing box and the rod, which will cause environmental pollution, especially in offshore oil production;

[0005] ③ The ground wellhead sealing device (packing box) of the conventional rod pump cannot provide an inlet and outlet channel for the power fluid and cannot meet the needs of hydraulic oil production.

[0006] The purpose of this new type of application is to solve the problem of ground sealing in hydraulic oil production, and at the same time adjust the length of the downhole oil pipe to achieve sealing of the hydraulic oil production wellhead. Utility Model Content

[0007] The utility model aims to provide a hydraulic oil production wellhead sealing device to solve the technical problems of the prior art that the sealing is not tight and the inlet and outlet channels of the power fluid cannot be provided.

[0008] The technical solution adopted by the utility model to solve its technical problems is:

[0009] A hydraulic oil production wellhead sealing device comprises: a main body, which is a hollow cylindrical structure, an inner core is installed in the main body, a main body step hole is provided inside the main body, a sealing protrusion is provided at a position corresponding to the position of the inner core and the main body step hole, the main body step hole and the sealing protrusion cooperate with each other to form a one-way limit, the right end of the inner core has an oil pipe connecting part which passes through the main body, the left end of the main body has a plug connecting part, a plug is installed in the plug connecting part, the main body has a lateral connecting head which is connected in a radial direction, the middle part of the inner core has an inner core passage which passes through the oil pipe connecting part, the middle part of the lateral connecting head has a connecting head passage which passes through, and the inner core passage and the connecting head passage are connected.

[0010] The utility model discloses a hydraulic oil production wellhead sealing device, wherein the plug connection part is connected with the plug through threads, and the right end of the plug is tightly pressed against the left end of the sealing protrusion.

[0011] A hydraulic oil production wellhead sealing device of the present utility model, wherein sealing rings are provided at both ends of the inner core corresponding to the passage position of the connecting head.

[0012] A hydraulic oil production wellhead sealing device of the present utility model, wherein the left end of the inner core has an inner core operation connection end, and the circumferential direction of the inner core operation connection end has threads.

[0013] A hydraulic oil production wellhead sealing device of the present utility model, wherein the tubing connection part and the outer part of the lateral connecting head have tubing threads.

[0014] A hydraulic oil production wellhead sealing device of the present utility model, wherein the main body and the lateral connecting head are connected by welding.

[0015] The beneficial effects produced by the present utility model are as follows: A hydraulic oil production wellhead sealing device is proposed. By providing a through connection between the lateral connecting head and the inner core, a power fluid inlet and outlet channel can be provided while achieving sealing. And the lateral connecting joint uses tapered pipe threads, which are easy to connect with the ground pipeline, realizing the docking of the ground power fluid and the downhole pipe string, and then realizing the inlet and outlet of the power fluid to achieve hydraulic oil production; by providing tubing threads at the tubing connection part, it can be quickly connected with the wellhead pipe fittings, facilitating sealing. At the same time, the length of the downhole pipe fittings can also be realized by connecting a short sucker rod section to the tubing connection part; by providing a sealing ring between the inner core and the main body, axial sealing can be achieved, solving the leakage problem of the packing box of the conventional rod pump oil production, which is beneficial to environmental protection, especially for the needs of offshore oil production; by providing an inner core operation connection end, when lifting is required, the inner core and the downhole pipe fittings can be lifted through a threaded connection with the lifting mechanism, which is the same as the ordinary operation process, simplifying the operation process and improving the operation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The present utility model will be further described below in conjunction with the drawings and embodiments. In the drawings:

[0017] Figure 1 is a schematic diagram of an embodiment of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0019] Such asFigure 1 As shown in the figure, a hydraulic oil production wellhead sealing device includes: a main body 100, the main body 100 is in a hollow cylindrical structure, an inner core 200 is sleeved inside the main body 100, the main body 100 has a main body stepped hole 110 inside, and the inner core 200 has a sealing convex part 210 at a position corresponding to the main body stepped hole 110. The main body stepped hole 110 cooperates with the sealing convex part 210 to form a one-way limit. The right end of the inner core 200 has a tubing connection part 220 that communicates with the main body. The left end of the main body 100 has a plug connection part 120, and a plug 300 is assembled in the plug connection part 120. The main body 100 has a lateral connection head 500 that is radially and through-connected. The middle part of the inner core 200 has an inner core passage 240 that penetrates the tubing connection part 220, and the middle part of the lateral connection head 500 has a through connection head passage 510. The inner core passage 240 and the connection head passage 510 are communicated.

[0020] In a preferred embodiment of the present invention, the plug connection part 120 and the plug 300 are connected by threads, and the right end of the plug 300 abuts against the left end of the sealing convex part 210.

[0021] In a preferred embodiment of the present invention, sealing rings 400 are provided at both ends of the inner core 200 corresponding to the position of the connection head passage 510.

[0022] In a preferred embodiment of the present invention, the left end of the inner core 200 has an inner core operation connection end 230, and the inner core operation connection end 230 has threads in the circumferential direction.

[0023] In a preferred embodiment of the present invention, the tubing connection part 220 and the lateral connection head 500 have tubing threads on the outside.

[0024] In a preferred embodiment of the present invention, the main body 100 and the lateral connection head 500 are connected by welding.

[0025] Brief description of the working principle: The working process is divided into three processes: installation, length adjustment, and disassembly.

[0026] Installation:

[0027] First, connect the tubing connection part 220 to the downhole tubing, then connect the right end of the main body 100 to the wellhead by threads, then rotate and tighten the plug 300, and finally connect the lateral connection head 500 to the surface high-pressure pipeline and process, so that the hydraulic oil production power enters or exits the downhole tubing, thereby realizing hydraulic oil production.

[0028] Adjustment of length:

[0029] When the length of the downhole string is insufficient or excessive, the tubing nipple can be removed or added on one side of the tubing connection part 220, and the rest is carried out according to the installation procedure.

[0030] Disconnect:

[0031] When work is required, first remove the plug. Use lifting equipment such as a workover rig or a crane, and connect the threaded connection of the inner core operation connection end 230 with a sucker rod nipple or other tools. Lift the inner core a certain distance, and then disconnect the threaded connection at the right end of the main body 100, thus realizing the disconnection of the wellhead sealing device.

[0032] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0034] It should be understood that those of ordinary skill in the art can make improvements or transformations according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of the present invention.

Claims

1. A hydraulic oil production wellhead sealing device, characterized in that, Comprising: A main body (100), the main body (100) being of a hollow cylindrical structure, an inner core (200) being sleeved inside the main body (100). A main body stepped hole (110) is provided inside the main body (100). At a position corresponding to the main body stepped hole (110) on the inner core (200), there is a sealing protrusion (210). The main body stepped hole (110) cooperates with the sealing protrusion (210) to form a one-way limit. The right end of the inner core (200) has a tubing connection part (220) that penetrates through the main body. The left end of the main body (100) has a plug connection part (120), and a plug (300) is assembled inside the plug connection part (120). The main body (100) has a lateral connection head (500) with a through connection in the radial direction. The middle part of the inner core (200) has an inner core passage (240) that penetrates through the tubing connection part (220). The middle part of the lateral connection head (500) has a through connection head passage (510). The inner core passage (240) and the connection head passage (510) are in communication.

2. The hydraulic oil production wellhead sealing device according to claim 1, characterized in that, The plug connection part (120) and the plug (300) are connected by threads, and the right end of the plug (300) abuts against the left end of the sealing protrusion (210).

3. A hydraulic oil production wellhead sealing device according to claim 1, characterized in that, Sealing rings (400) are provided at both ends of the inner core (200) at positions corresponding to the connection head passage (510).

4. A hydraulic oil production wellhead sealing device according to claim 1, characterized in that, The left end of the inner core (200) has an inner core operation connection end (230), and the inner core operation connection end (230) has threads in the circumferential direction.

5. The hydraulic oil production wellhead sealing device according to claim 1, characterized in that, The tubing connection part (220) and the lateral connection head (500) have tubing threads on the outside.

6. The hydraulic oil production wellhead sealing device according to claim 1, characterized in that, The main body (100) and the lateral connection head (500) are connected by welding.

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